Common Tern

Lime ring with a black three alpha-numeric code.

note 1 : Always letter 'N' on the first position.

note 2 : The letter N is followed by one letter and one number (eg. NV2 or N2V).  

note 3 : Used letters are : A, C, F, H, K, L, N, P, R, S, T, V, X, Z. Used numbers are 1, 2, 3, 4, 5, 6, 7, 8, 9.

note 4 : These codes were used in 2020-2021 on both adult and juvenile birds during the breeding season in the southwest of the Netherlands.

note 5 : A joint project of the Research Institute for Nature and Forest (INBO), Bureau Waardenburg and Ringgroup Delta.

note 6 : We use colour-rings in order to gain information on habitat use, juvenile dispersal, age of return and recruitment to the breeding colonies in the southwest of The Netherlands or beyond.

note 7 :

Light-green ring with a black three alpha code and metal ring (on other leg).

note 1 : starting letter "A", followed by letters. Used codes : A00-AYX.

note 2 : birds ringed since 2021.

note 3 :

Red ring with a white three numeric code.

note 1 : used codes: 400 - 499.

note 2 : birds ringed in Cumbria and North Lancs, UK.

note 3 : 

Orange ring with a black three alpha code.

note 1 : used codes are : AAA-FZZ.

note 2 :

Yellow legring with a black three alpha code (on tarsus left) and metal ring (on tarsus right).

note 1 : to be read from bottom till top.

note 2 :

Red ring with a white 3 alpha-numeric code, starting letter R.

note 1 : codes used : R01-R99.

note 2 : birds are ringed in the Gambia starting 2020

note 3 :

Red ring with a white three numeric code, starting number "3" and a dot '.' between second and third number.

note 1 :

White ring with a black three numeric code, starting number "3" and a dot '.' between second and third number.

note 1 :

Yellow ring with a black three alpha-numeric code, starting letter 'C' (on left leg) and metal ring (on right leg).   

note 1 : birds ringed in UK, by Southern-colour Ringing Group in the London and surrounding areas.

note 2 : used codes are : CA1 – CX0 (C. letter. number) and C1A – C0X (C. number. letter)                                 

note 3 :

Yellow ring with a black three alpha-numeric code.

note 1 : L on the first place and afterwards letter / letter or number / letter or letter / number (LAA-LZZ, LA0-LZ9, LA0-LZ9).

note 2 : during 2020 and 2021 used codes are : L.0A untill L.9Z and L.A0 untill L.Z9

note 3 : birds ringed in the Dutch inland.

note 4 : in the next years code LAA untill LZZ would be used.

note 5 :